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Mineralization, Geochemistry and Zircon U-Pb Ages of the Paodaoling Porphyry Gold Deposit in the Guichi Region, Lower Yangtze Metallogenic Belt, Eastern China
Liu'an DUAN,
Xiaoyong YANG,
Jianghong DENG,
Fangyue WANG,
Insung LEE,
Liu'an DUAN
CAS Key Laboratory of Crust-Mantle Materials and Environments, University of Science and Technology of China, Hefei 230026 China
Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029 China
No.7 Gold Geological Party of the Chinese People's Armed Police Force, Yantai 264004 Shandong, China
Search for more papers by this authorCorresponding Author
Xiaoyong YANG
CAS Key Laboratory of Crust-Mantle Materials and Environments, University of Science and Technology of China, Hefei 230026 China
Corresponding author. E-mail: [email protected] (X.Y. Yang)Search for more papers by this authorJianghong DENG
CAS Key Laboratory of Crust-Mantle Materials and Environments, University of Science and Technology of China, Hefei 230026 China
Laboratory for Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266237 Shandong, China
Center of Deep Sea Research, Institute of Oceanography, Chinese Academy of Sciences, Qingdao 266071 Shandong, China
Search for more papers by this authorFangyue WANG
School of Resources and Environmental Engineering, Hefei University of Technology, Hefei, 230009 China
Search for more papers by this authorInsung LEE
School of Earth and Environmental Sciences, Seoul National University, Seoul 151-742 Korea
Search for more papers by this authorLiu'an DUAN,
Xiaoyong YANG,
Jianghong DENG,
Fangyue WANG,
Insung LEE,
Liu'an DUAN
CAS Key Laboratory of Crust-Mantle Materials and Environments, University of Science and Technology of China, Hefei 230026 China
Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029 China
No.7 Gold Geological Party of the Chinese People's Armed Police Force, Yantai 264004 Shandong, China
Search for more papers by this authorCorresponding Author
Xiaoyong YANG
CAS Key Laboratory of Crust-Mantle Materials and Environments, University of Science and Technology of China, Hefei 230026 China
Corresponding author. E-mail: [email protected] (X.Y. Yang)Search for more papers by this authorJianghong DENG
CAS Key Laboratory of Crust-Mantle Materials and Environments, University of Science and Technology of China, Hefei 230026 China
Laboratory for Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266237 Shandong, China
Center of Deep Sea Research, Institute of Oceanography, Chinese Academy of Sciences, Qingdao 266071 Shandong, China
Search for more papers by this authorFangyue WANG
School of Resources and Environmental Engineering, Hefei University of Technology, Hefei, 230009 China
Search for more papers by this authorInsung LEE
School of Earth and Environmental Sciences, Seoul National University, Seoul 151-742 Korea
Search for more papers by this authorAbout the first author:
DUAN Liu'an, male, born in 1976, in Changge City, Henan Province; Ph.D.; postdoctoral research in Institute of Geology and Geophysics, Chinese Academy of Sciences; He is now interested in the study of Cu-Au deposits. Email: [email protected].
Abstract
The newly discovered Paodaoling porphyry Au deposit from the Guichi region, Lower Yangtze River Metallogenic Belt (LYRB), contains >35 tons of Au at an average grade of ∼1.7 g/t. It is a porphyry ‘Au-only’ deposit, as revealed by current exploration in the depths, mostly above –400 m, which is quite uncommon among coeval porphyry mineralization along the LYRB. Additionally, there are also Cu-Au bearing porphyries and barren alkaline granitoids in the Paodaoling district. Zircon LA-ICP-MS U-Pb dating of the Cu-Au-bearing porphyries yield an age of 141–140 Ma, falling within the main magmatic stage of the LYRB, whereas the barren granites give an age of 125–120 Ma, coeval with the regional A-type granites. The Cu-Au-bearing porphyries are LILE-, LREE-enriched and HFSE-depleted, typical of arc magmatic affinities. The barren granites are HFSE-enriched, with lower LREE/HREE ratios and pronounced negative Eu anomalies. The Cu-Au-bearing porphyries in the Paodaoling district have high oxygen fugacities and high water content. Pyrite sulfur isotopes of the Paodaoling gold deposit indicate a magmatic-sedimentary mixed source for the ore-forming fluids. Based on the alteration and poly-metal zonation of the deepest exploration drill hole from the Paodaoling Au deposit, we propose that Cu ore bodies could lie at depth beneath the current Au ore bodies. The magmatism and associated Cu-Au mineralization of the Paodaoling district are likely to have formed in a subduction setting, during slab rollback of the paleo-Pacific plate.
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